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Agent skill

Modify Feature

by microbus-io in microbus-io/fabric

TRIGGER when user asks to change the signature, route, method, arguments, or return type of an existing endpoint, config, metric, or ticker.

Apache-2.0Auto-check passedBackend & APIs

Install Modify Feature

skills CLI
$ npx skills add microbus-io/fabric --skill modify-feature -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install microbus-io/fabric modify-feature --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/microbus-io/fabric.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/microbus/modify-feature .claude/skills/modify-feature && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
modify-feature
GitHub stars
172
Token cost
~1k tokens
SKILL.md length
427 words
Files
1
Skills in repo
32
Repo updated
First seen
Licence
Apache-2.0

At a glance

TRIGGER when user asks to change the signature, route, method, arguments, or return type of an existing endpoint, config, metric, or ticker.

  • Works in 7 steps: Read Local CLAUDE.md File → Identify the Feature → Consult the Corresponding "Add" Skill → …
  • User asks to change the signature
  • Calls go
  • Return type of an existing endpoint

What it does

Modify Feature is an agent skill from microbus-io/fabric. TRIGGER when user asks to change the signature, route, method, arguments, or return type of an existing endpoint, config, metric, or ticker.

Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Backend & APIs, covering Microservices. The repository describes itself as: Microbus is the only fabric where every agentic workflow runs on a true microservice substrate - giving your workflows security, scale, observability, and prompt-driven authoring. The licence is Apache-2.0.

When your agent uses it

  • User asks to change the signature
  • Return type of an existing endpoint

Example prompts

  • “/modify-feature”

Workflow steps

7 steps, taken from the step headings in SKILL.md.

  1. Read Local CLAUDE.md File
  2. Identify the Feature
  3. Consult the Corresponding "Add" Skill
  4. Apply the Change
  5. Generate the Boilerplate
  6. Update the Tests
  7. Housekeeping

What it can do on your machine

Read from SKILL.md and the folder at commit fb98098. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • go

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Modify Feature loads about 1k tokens when it runs. Until then it costs about 39 tokens; SKILL.md has 427 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~39
When it runs · the whole SKILL.md, loaded when a task matches
~1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from microbus-io/fabric at commit fb98098, republished under its Apache-2.0 licence (© microbus-io). 427 words, ~1,009 tokens.

Download SKILL.mdSave it as .claude/skills/modify-feature/SKILL.md (or your agent's skills folder).
name
modify-feature
description
TRIGGER when user asks to change the signature, route, method, arguments, or return type of an existing endpoint, config, metric, or ticker.

CRITICAL: Read and analyze this microservice before starting. Do NOT explore or analyze other microservices. The instructions in this skill are self-contained to this microservice.

CRITICAL: A feature is declared in myserviceapi/definition.go (its define.* var, plus In/Out structs for endpoints) and implemented in service.go (its handler). Edit those, then run cmd/genservice.

CRITICAL: Keep the // MARKER: MyFunction comments when editing.

Workflow

Copy this checklist and track your progress:

Modifying a feature of a microservice:
- [ ] Step 1: Read local CLAUDE.md file
- [ ] Step 2: Identify the feature
- [ ] Step 3: Consult the corresponding "add" skill
- [ ] Step 4: Apply the change
- [ ] Step 5: Generate the boilerplate
- [ ] Step 6: Update the tests
- [ ] Step 7: Housekeeping
Step 1: Read Local CLAUDE.md File

Read the local CLAUDE.md file in the microservice's directory. It contains microservice-specific instructions that should take precedence over global instructions.

Step 2: Identify the Feature

Find the feature's define.* var in myserviceapi/definition.go. Its type determines which "add" skill governs its shape:

define.* kindFeature typeCorresponding skill
define.FunctionFunctional endpointadd-function
define.WebWeb handleradd-web
define.ConfigConfiguration propertyadd-config
define.TickerTickeradd-ticker
define.MetricMetricadd-metric
define.OutboundEventOutbound eventadd-outbound-event
define.InboundEventInbound eventadd-inbound-event
define.TaskTask endpointadd-task
define.WorkflowWorkflow graphadd-workflow
Step 3: Consult the Corresponding "Add" Skill

Read the SKILL.md of the corresponding "add" skill identified in the previous step. It defines what the define.* var, the In/Out structs, and the handler should look like. Use it as your reference throughout.

Show full SKILL.md (232 more words)Show less
Step 4: Apply the Change

Edit definition.go and/or service.go according to the kind of change. The generated files are NOT touched here.

  • Implementation only - edit the handler body in service.go.
  • Property change (route, method, required claims, time budget, load balancing, config default/validation/secret/callback, metric buckets/labels, ticker interval) - edit the corresponding field on the define.* var in definition.go. Add or remove the field's import if its type requires one (e.g. "time").
  • Signature change (arguments added, removed, renamed, or retyped) - edit the In/Out structs in definition.go (add/remove fields and their jsonschema tags), add or remove sibling complex-type files in the api package as needed, and update the handler signature in service.go.
  • Rename - rename the define.* var, its In/Out structs, and their // MARKER comments in definition.go; rename the handler and its // MARKER in service.go. The generated files pick up the new name on regeneration.

These scopes can overlap; handle a rename-plus-signature change in a single pass.

Step 5: Generate the Boilerplate

From the microservice's directory, run the generator. It regenerates client.go, intermediate.go, mock.go, mock_test.go, and manifest.yaml from the updated definition.go.

shell
go run github.com/microbus-io/fabric/cmd/genservice .

Then verify the microservice compiles with go vet ./... from the project root.

Step 6: Update the Tests

Update service_test.go to match the change: edit test cases that call the feature with the old signature, behavior, or name, and rename the test function (e.g. TestMyService_MyFunction becomes TestMyService_NewName) on a rename.

Step 7: Housekeeping

Follow the housekeeping skill.

© microbus-io, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .claude/skills/microbus/modify-feature of microbus-io/fabric.

Open the folder on GitHubat commit fb98098

Compare with similar skills

Modify Feature next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Modify Feature compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Modify Feature this skillmicrobus-io/fabric172—~1kAutomated safety check: PassApache-2.0
Node Backend Development Guidelinesdiet103/claude-code-infrastructure-showcase10k2 repos~2kAutomated safety check: PassMIT
Nodejs Backend Patternsever-works/ever-works15818 repos~4kAutomated safety check: PassAGPL-3.0
AWS Serverless Edazxkane/aws-skills3674 repos~3.2kAutomated safety check: PassMIT
Golang Proantoniopaya22/go-rest-template1723 repos~1.2kAutomated safety check: PassMIT
Dr Jskilljdubois/dr-jskill342—~4.6kAutomated safety check: NotesApache-2.0

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More from microbus-io/fabric

All 32 skills in this repo

  • Add Config

    microbus-io/fabric

    TRIGGER when user asks to add or modify a configuration property or setting, or to make a value configurable.

    172 GitHub stars~2.3k tokensUpdated 10 days ago
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  • Add Function

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    TRIGGER when user asks to add, create, or modify an API endpoint, function, or RPC, or a route that accepts typed arguments and returns typed results.

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  • Add Inbound Event

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    172 GitHub stars~1.4k tokensUpdated 10 days ago
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  • Add Metric

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    TRIGGER when user asks to add or modify a metric, counter, gauge, or histogram, or to track/measure an operation.

    172 GitHub stars~1.5k tokensUpdated 10 days ago
    Auto-check passed

  • Add Outbound Event

    microbus-io/fabric

    TRIGGER when user asks to fire, emit, or publish an event that other microservices can subscribe to.

    172 GitHub stars~1.7k tokensUpdated 10 days ago
    Auto-check passed

  • Add Python Function

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    TRIGGER when user asks to add a Python-backed function endpoint to an existing Python-backed microservice.

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Categories

Questions about Modify Feature

What does Modify Feature do?

TRIGGER when user asks to change the signature, route, method, arguments, or return type of an existing endpoint, config, metric, or ticker. Modify Feature is an agent skill from microbus-io/fabric. TRIGGER when user asks to change the signature, route, method, arguments, or return type of an existing endpoint, config, metric, or ticker.

When should I use Modify Feature?

Modify Feature fits situations like: user asks to change the signature; return type of an existing endpoint.

How do I install Modify Feature in Claude Code?

Run `npx skills add microbus-io/fabric --skill modify-feature -a claude-code`. Or copy the skill folder (.claude/skills/microbus/modify-feature in microbus-io/fabric) into .claude/skills/modify-feature in your project. Claude Code loads it when a task matches its description.

How do I install Modify Feature in Codex?

Run `npx skills add microbus-io/fabric --skill modify-feature -a codex`. Or copy the skill folder (.claude/skills/microbus/modify-feature in microbus-io/fabric) into .agents/skills/modify-feature in your project. Codex loads it when a task matches its description.

Can I use Modify Feature in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add microbus-io/fabric --skill modify-feature -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/modify-feature, .gemini/skills/modify-feature, .github/skills/modify-feature and .opencode/skills/modify-feature in your project.

What does Modify Feature need to run?

Going by SKILL.md and its folder, Modify Feature needs the command-line tools its instructions call (go).

Does Modify Feature access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Modify Feature safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Modify Feature use?

Modify Feature is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Modify Feature use?

About 1k tokens (SKILL.md is roughly 4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Modify Feature?

Skills that share tags, products or a category with Modify Feature: Node Backend Development Guidelines (diet103/claude-code-infrastructure-showcase, 10k stars), Nodejs Backend Patterns (ever-works/ever-works, 158 stars), AWS Serverless Eda (zxkane/aws-skills, 367 stars) and Golang Pro (antoniopaya22/go-rest-template, 172 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Modify Feature?

microbus-io (a GitHub organization) maintains it in microbus-io/fabric, which has 172 GitHub stars. The repository holds 32 skills in this directory. The repository was last updated on September 28, 2026.

Source: microbus-io/fabric on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.